Gunflint Trail (north shore/grand marais) TT free camping?

Generally the Forest Service tries to NOT locate or build portages in swamps and wet areas. And yes a portage would seldom begin or end in a swamp. But sometimes it is unavoidable to cross a wet area because it is the only route to get from one lake to another. In many, but not all cases, they put primitive boardwalks through the wet areas.